pistols dying?

Hello all,
I have an outdoor plant that is a week or two from harvest. I checked on it a few days ago and noticed that the buds on one stem looked like someone held a lighter right over them and burned the crap out of it.

The leaves at the very top are all withered, still green though, and the pistols are halved in length and half brown in color.

The weird thing is is that the other stem on the same plant is progressing fine. My other plants are fine as well.

The soil is a mix of personal compost, perilite, and vermiculite. It is watered once every 3-4 days when needed. I havnt used much fertilizer this time around.

I dont have a ph tester(I bought one from home depot but the thing only read 7, at all times lol) but I know i need to buy one.

i killed off all the males ages ago, but its a possibility. I never even considered it could just be pollinated

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Outdoor grows always give you new things to think about. The problem could be pollination or insects. One of my ladies got shaved in the same fashion early in her flower. She has recovered fully. Good Luck